A navigation/guidance system uses a dead reckoning navigator with periodic GPS fixes to correct the drift of the inertial system. The navigation system primarily uses speed sensed by Doppler radar and attitude and heading sensed by a set of gyros. The navigation system uses various processes to compensate...http://www.google.com.au/patents/US5928309?utm_source=gb-gplus-sharePatent US5928309 - Navigation/guidance system for a land-based vehicle
